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Full Discussion: Comparing two files and list the difference with common first line content of both files
Top Forums UNIX for Beginners Questions & Answers Comparing two files and list the difference with common first line content of both files Post 303041026 by sarathy_a35 on Tuesday 12th of November 2019 11:08:57 AM
Old 11-12-2019
Only Diff command here will not give the required output .. im trying to bring the filename and non-matching patterns in single line as shown below

Code:
Required Output:
*********************

/local/test_1  default:user::rwx,default:group::r-x ,default:other::r-x,default:group:sgg:rwx,default:group:sgg_1:r-x
/local/test_1/2019 default:user::rwx,default:group::r-x ,default:group:sgg_1:r-x
/local/test_1/2019/10  default:user::rwx, default:group::r-x,default:other::r-x,default:group:sgg_0:rwx,default:group:sgg_3:r-x

--- Post updated at 05:08 PM ---

Code:
sed 's/^# file.*/&\n\n&\n/' file2 | diff -y -b --suppress-common-lines - file1

While using the above command , the result is partially matching but having <, > & whitespaces , could you please help me to get the desired output.
 

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LEARN ABOUT MINIX

pnmpsnr

pnmpsnr(1)                                                    General Commands Manual                                                   pnmpsnr(1)

NAME

       pnmpsnr - compute the difference between two portable anymaps

SYNOPSIS

       pnmpsnr [pnmfile1] [pnmfile2]

DESCRIPTION

       Reads  two  PBM,  PGM, or PPM files, or PAM equivalents, as input.  Prints the peak signal-to-noise ratio (PSNR) difference between the two
       images.  This metric is typically used in image compression papers to rate the distortion between original and decoded image.

       If the inputs are PBM or PGM, pnmpsnr prints the PSNR of the luminance only.  Otherwise, it prints the separate PSNRs of the luminance, and
       chrominance (Cb and Cr) components of the colors.

       The  PSNR  of  a  given component is the ratio of the mean square difference of the component for the two images to the maximum mean square
       difference that can exist betwee any two images.  It is expressed as a decibel value.

       The mean square difference of a component for two images is the mean square difference of the component value, comparing  each  pixel  with
       the pixel in the same position of the other image.  For the purposes of this computation, components are normalized to the scale [0..1].

       The maximum mean square difference is identically 1.

       So the higher the PSNR, the closer the images are.  A luminance PSNR of 20 means the mean square difference of the luminances of the pixels
       is 100 times less than the maximum possible difference, i.e. 0.01.

SEE ALSO

       pnm(5)

                                                                   04 March 2001                                                        pnmpsnr(1)
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